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Finding the Fourth Proportional to 581.31, 869.90 and 426.87

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Solution

The fourth proportional to 581.31, 869.90 and 426.87 is: 638.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.31 : 869.90 = 426.87 : x
  2. Step 2: Convert to fraction form
    581.31/869.90 = 426.87/x
  3. Step 3: Cross multiply
    581.31x = 869.90 × 426.87
  4. Step 4: Simplify right side
    581.31x = 371,332.08
  5. Step 5: Solve for x
    x = 371,332.08/581.31
  6. Step 6: Final answer
    x = 638.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.